Boring bar



. H. H. MANNING BORING BAR Filed Nov. 22, 1924 Sept. 18, 192a Patented Sept. 18", Q

UNITED STATES 1 nowm n. mme, or mmnvmm, rniinsrnvlmm, ASSIGNOR 'rou cnosxr,

- TOOL CORPORATION, OF ME ADVILLE, rmmmvmu;

BORING an.

Application fled sm ar 2a, 19:24v Serial No. 151328.

This invention relates to boring bars-and 'more particularly to the means for adjusting the vcutters thereof.

Briefly stated, an important ob'ectof this r invention is to provide a, boring ar wherein simple and reliable means are provided for simultaneously adjusting'a plurality of cutters by the turning of asingle adjusting member. 7

A further object is to provide a boringbar having novel means to hold the cutters securelyin an adjusted position so that the cutting diameter of the tool is not decreased during operation. I

' Other ob'ects and advantages will be apparent during the course of the following a description; Y In the accompanying drawing forming a part of this application andv in which like 20 numerals are employed to designate like parts throughout, the same,

a Figure l is a perspective o boring bar; I

Figure 2 is a detail lon view through the same.

Figure 3 is acvertical transverse sectional view through the boring bar; 4 I Figure. 4 is a group perspective illustrate ing the cutters and the adjusting means 3 therefor. 1 t

' Figure 5 is a vertical transverse sectlonal View illustrating the means to hold the blades .7 inaset positio Figure 6 is a detail sectional view illustratx; in a modified form'ofinvention. iigure 7 is a ,detail sectional view taken online 7-7 'of Figure 6.

In vthe drawing the numeral 5 designates a boring bar having a transverse openin 6 40 receiving radially arranged cutters the m-.

ner portions of which are reduced n thickness and'are overlapped as illustrated in Figures'2 ands. 1

Figure at also illustrates that one-edge of a5 eachcutter is formed with diagonal grooves" 8,- arranged at right angles to the similarly. formed grooves 011- the same edge of the outer cutter. The ribs formed by thegrooves 8 are engagedby the intersecting ribs 9 on the flat face of an adjusting block 10.- Figure 2 plainly illustrates "that. the intersecting ribs 9 are received in thegrooves 8 and move the I cutters 7 either in or out; Of time the lone-- 'gitudinal movement of the bloc '10 resultsin 55 the radialflmovement of, the cutters 7 and 1 4 f the improved gitudinal sectional .the movement of the screw inflthe otherdi-' so that the tool ma bring about a longitudinal movement of the block 10 an adjusting screw 11 threaded through theblock'is' turned by engaging a suitable tool with the head 12 of the same. The block 10 and the feed screw 11 are received in a socket 14 extending at right 2111- gles to the transverse opening 6 and the in-. ner end of the screw 11 is received in a cone shaped recess 15 in the inner end of the socket 14 so that the feed screw may be convenie ntly turned. i

The longitudinal movement of the feed screw 11 is limited in one direction by the engagement (gf the'for'ward end of the same with the iriner wall of the socket 14, while I l.

rection is limited by the engagement of an annular shoulder 16 on the rear portion of the same with the'retaining .nut 17 threaded into oneside ofthe bar 5'. The outer surface of the retaining nut 17 may be calibrated to co-operate with the head 12 in indicating the" the position of the cutters. I 7

From the foregoing it will be seen that the intersecting ribs 9 on thefiat face of the sleeve or adjusting block 10 are received in the grooves 8 in the overlapped portions of the cutters 7 and thereby establish a constant operative connection between the block 10- and the cutters 7. As the inner portions of the cutters overlap each cutter has a contact wit-lithe adjusting block equal to the-entire face of the block when the cutters are adjustcdt'o-the minimum, diameter. In other words. a substantial bearing surface is rovided between'the adjusting block and t e cutters 7 ybe quickly adjusted to the desired diameter. 7

The cutters 7 may be engaged at their smooth edges by locking cams 170 by means ofwhich the cuttersare securely held in po-' sition. v In the operation of this form of invention the turning of the feed screw 11 moves the block 10. longitudinallyrsotlrat the cutters 7 are moved radially to the desired position. It might be saidthatthe cutters mutually brace each otherdue to their over-flapping and r slidable connection vas illustrated in Figures "1057 2 and 4:. v In the form of the invention illustrated i Fi res 6 and 7 the boring bar'is *desig nated y the numeral and is provided with diagonal slots or} bpeiiing'sB]. forthere ception of currents the'outer pore 110 tions of which are provided withcutting e 35. igure 6 plainly illustrates thatthe cutters 33and 34 are arranged-at right angles '5 to each other and have their posed sides formed with interfitting ribs 3?. The ribs extend diagonally of the cutter-sand at right angles to the longitudinal axis of the bar so that when one cutter is moved longitudinally of itself the other cutter is simultaneously 'moved. Specifically, thediagonally extending cut ter 33 is backed up by a screw 38 having means whereby the same may be engaged by 1 'a screw driver, a squared tool or the like.

To adjust both of the blades simultaneously side' of the adjusting device being flat and it is merely necessary to turn the screw 38 to advance the cutter 33 and the interfitting con nect-ion between the several cutters causes the cutter 34 to move also. The construction illustrated provides for exactly the. same movement of the two cutters and a very fine adjustment may be made. Of course in car- 1 ryin out the invention the diagonal opening 2 for t e reception of the cutter 33 has its Wall threaded from the periphery of the bar to the opening extending at right angles thereto to provide fora wide range of adjustment.

The foregoing illustrates that the inven- 0 tion is capable of a variety of mechanical expressions and therefore it is to be understood that the form of the invention herewith shown and describedis to be taken 'as a prei ferred example of the. same and that such is minor changes in arrangement and construction of parts maybe made as will remain within the spirit of the invention and the scope of what is claimed.

Having thus described the m is claim is:-- j V 1. A boring bar comprising a body, cutters movable through said body andformed with diagonal grooves, the grooves in one cutter arranged approximately at right invention, what angles to the other grooves, an adjusting" block a flat side provided withrows ofintersectmg ribs received in said grooves of the cutters and movable at right angles -to the line of movement of said cutters l0 2. A boring bar comprising a body having r a transverse opening, adjustable cutters received in said opening and formed withinclined grooves, and an adjusting block havs a at surface provided 'with rows of ini5 tersecting ribs received in said grooves of the cutters and movable at right angles to the line of movement of said cutters, and a feed screw threaded through said blockl 3. A cutting device of the character specified comprising a body having an opening, cutters movable in said opening and filling the major portion of the same and having op-' posed contacting faces, said cutters having edges provided with grooves, and an adjusting-block having straight intersectin ribs inter-fitting. in said grooves and move le at right angles to the line of movement of said cutters to adjust the cutting diameter of the f device I 4. A rotary cutter comprising a bod cutters carried by the body, a longitu inally movable adjusting device positioned entirely at one side of the cutters and movable at an angle to the plane of thecutters, one

having intersecting serrations, the d es of said cutters adjacent the-flat serrate side of.

said adjusting device having serrations interfitting withthe intersecting serrations of the adjusting device, the serrations in one cutter being at an angle to the serrations in the other cutter, and means whereby said adjusting device may be moved lengthwise,- 5. A rotary cutter comprising a body having an opening, radially adjust-able cutters in said opening and having overlapping inner terminal portions provided with serra- ,tions, an adjusting device at one side of said overlapping inner terminal portions and having straight intersecting serrations interfitting with theserrations on each of the cut ters, and means to move the adjusting device transversely of said body. j 6. A rotary cutter comprising abody, adjustable cutters associated with the bod and having serrations, and an adjusting having one face-thereof provided with interthe serrations of said cutters 7. A rotary cutter comprising abody, adjustable cutters associated with thebod and having serrations, and an adjusting evice havingintersecting serrations defining facets tersecting serrations defining facets engagi ing the serrations of the cutters, and a screw engagedwith said adjusting device and being extended transversely of the body.

\ HOWAJRD H. Manama.

evice secting serrations defining facets engaging loo the serrations *ofsaid cutters, said 

